Nangong Yi received the letter handed over by Cai Wei and asked a question.
Cai Wei laughed and said, "You'll know once you read it!"
Nangong Yi opened the letter and found it was one written by Nangong Shi to Li Kaifeng. One of them was even about the message he told Li Kaifeng that Cai Wei had been taken by Saknu, no wonder Li Kaifeng was able to detect that the substitute in the Imperial Court was fake.
After reading these several letters, Nangong Yi laughed secretively and tucked away the last one, holding the others he said, "Aren't you looking for evidence of Li Kaifeng colluding with Nangong Shi? I just happen to have a few letters here written by Nangong Shi to your Great General. Take a good look with keen eyes, if you still don't believe, dig out the writings that Nangong Shi wrote before and compare the handwriting."
After speaking, he ordered Yang Yong to take the letters down and distribute them to all the officials for inspection.
